电力电缆绝缘损伤的非线性辨识及故障定位  

Non-linear identification and fault location of power cable insulation damage

作　　者：黄振峰[1] 袁大海 毛汉领[1] 张玉华 黄悦峰 李欣欣[1] 曾令通[3] HUANG Zhen-feng;YUAN Da-hai;MAO Han-ling;ZHANG Yu-hua;HUANG Yue-feng;LI Xin-xin;ZENG Ling-tong(College of Mechanical Engineering,Guangxi University,Nanning 530004,China;College of Light Industry and Food Engineering,Guangxi University,Nanning 530004,China;Department of Electrical Engineering,Guangxi Electrical Polytechnic Institute,Nanning 530007,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]广西大学轻工与食品工程学院,广西南宁530004 [3]广西电力职业技术学院电力工程系,广西南宁530007

出　　处：《广西大学学报（自然科学版）》2018年第5期1747-1755,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51365006)

摘　　要：电力电缆在绝缘老化、局部过热、超负荷等情况下会出现绝缘非线性特性增强。文中针对电缆绝缘损伤的非线性特性,基于Volterra级数理论,建立电力电缆绝缘损伤的非线性输出频率响应函数,并由此构建两个检测指标Fe和NE,以此来辨识电力电缆绝缘损伤,通过Simulink仿真模拟和实验验证了Fe和NE辨识的可行性,结果显示,这种方法提高了低压脉冲法在电缆故障检测中的测试范围;并用经验模态分解(Empirical Mode Decomposition,EMD)方法对电缆故障信号进行分解,将分解得到的固有模态函数(Intrinsic Mode Function,IMF)进行奇异性检测与计算,以获得电缆故障位置。结果表明,该方法可以辨识绝缘损伤,并可以准确定位电缆故障。The non-linear characteristics of power cable insulation in a state of insulation aging,local overheating and overload are enhanced.A method based on the theory of the Volterra series was proposed to establish the nonlinear output frequency response function of power cable insulation damage and thus to build two indexes F e and N E to identify the damage of power cable.The F e and N E were verified by Simulink simulation and experiments.The results show that this method improves the test range of low voltage pulse method in cable fault detection;The fault signal of power cable is processed by empirical mode decomposition(EMD)method,the decomposed intrinsic mode function(IMF)is detected by singularity,and then to calculate fault distance and to estimate the cable fault location.Results indicate that the method can accurately locate the cable fault with small range error.

关 键 词：NOFRFs 电缆绝缘 损伤指标 奇异性检测 

分 类 号：TM855.2[电气工程—高电压与绝缘技术]